﻿using System;
using System.Text;
using System.Text.RegularExpressions;

namespace Paas.Pioneer.Domain.Shared.Helpers
{
	public static class UnicodeHelper
	{
		/// <summary>
		/// 字符串转Unicode码
		/// </summary>
		/// <returns>The to unicode.</returns>
		/// <param name="value">Value.</param>
		public static string StringToUnicode(string value)
		{
			byte[] bytes = Encoding.Unicode.GetBytes(value);
			StringBuilder stringBuilder = new StringBuilder();
			for (int i = 0; i < bytes.Length; i += 2)
			{
				// 取两个字符，每个字符都是右对齐。
				stringBuilder.AppendFormat("u{0}{1}", bytes[i + 1].ToString("x").PadLeft(2, '0'), bytes[i].ToString("x").PadLeft(2, '0'));
			}
			return stringBuilder.ToString();
		}

		/// <summary>
		/// Unicode转字符串
		/// </summary>
		/// <returns>The to string.</returns>
		/// <param name="unicode">Unicode.</param>
		public static string UnicodeToString(string unicode)
		{
			unicode = unicode.Replace("%", "\\");

			return new Regex(@"\\u([0-9A-F]{4})", RegexOptions.IgnoreCase | RegexOptions.Compiled).Replace(
				 unicode, x => string.Empty + Convert.ToChar(Convert.ToUInt16(x.Result("$1"), 16)));
		}
	}
}